SQL term used to describe when a `SELECT` statement is used as part of a larger SQL statement. The larger statement may be DML and is always found within brackets or parenthesis.

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time interval period in sql [closed]

How to display the time period of the most widely in use in ms sql server I have purchase data, such as: hours the number of purchases 10:00 2 12:00 4 13:00 5 14:00 1 ...
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Query performance with subquery and IN clause

I am trying to select a range of data for multiple devices (unique serial numbers) from a historical table and was wondering why there is such a big difference in time for the following queries: ...
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SQLITE: A problem of tags and products

I'm searching for a way to create a query to do the following: Let's consider 3 tables: products: List of products tags: list of tags tag_ties: table used to associate a tag to a product Let's ...
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What could be the reason for disallowing a sub query in the values clause?

For example SQL> create table dates(d date); Table created. SQL> insert into dates select sysdate from dual; 1 row created. SQL> select * from dates; D --------- 28-MAY-11 SQL> ...
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How to convert a Top 1 subquery using outer table alias to Oracle?

I have the following SQL Server query select (select top 1 b2 from BB b where b.b1 = a.a1 order by b2) calc, a1, a2 from AA a where a2 = 2; which I can rewrite using analytic functions ...